A copartnership



C. F. RANDALL, J'. TI CLARK, AND J. T. SMITH. DAMPER.

APPLlcmoN FILED MAY16,192|.

1,408,223 l Patented Feb.' 28, 1922.

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UNrIan stares PATENT orma CIIARLns n. RANDALL, msnen T. CLARK, ANnJAMnsT. sMITH, or SPRINGFIELD,

MASSACHUSETTS, Assis-neas To entraron DAMPER CoIvrrANY, or SPRING-FIELD, -MAssACITUsnTTs CorAnTNnssII'Ir. v

DAMIEB.

Specincation of Letters Patent. Patented Feb, 28, 1&22,

Application filed May 16, 1921. Serial No. 420,138.

lowing is a specification.

This invention relates to improvements in dampers or draftregulators forstoves, furnaces and like heat producing apparatus.

An object of 4the invention is to provide aV damper structure that willpermit the products of combustionV to readily passup the chimney orstove pipe, and at the saine time will prevent the escape of, or holdback,fthe combustible gases which are liberated during the burning rorconsumption of the fuel. These gases, as is well known, lcontain elements of combustion which are capable of increasing the thermalefliciency of the heating apparatus if ignited before passingor escapingup the chimney. In other words, these uncons'umed gases include elementswhich, 'when combined with the proper quantity of air, -will ignite,thus producing a flame, which thereby increases they thermal efficiencyof the heating apparatus. In

order to bring about this increased eiiiciency the present improvementprovides means for temporarily7 retaining or holding'these gases infthecombustion chamber until they are thoroughly consumed before permittingthem to escape up the/stove pipe.

The present invention broadly considered comprises adamper constructionin which a centrally disposed plate is provided and plates located onthe oppositesides of the same to serve as a check or baffle to preventthe escape o f the combustible` gases `before they are thoroughlyconsumed. positely disposed plates also prevent any back or down draftfrom the chimney from counteracting the normal or upward flow of theproducts of combustion.

These and other objects of the invention will appear in the body of thespecification and will be pointed out in the claims.

Referring to the drawing:

Fig. 1 is a plan view, showing the stove pipe in section, the damperpart, and the means for moving the same.

Fig. 2 is a sectional view on the line 2-2 of Fig. 1, showing the mea-nsfor attaching the spindlev or shaft to the'damper. i Fig. 'isa sectionalView of Fig. 1 taken ona plane through the axisof the shaft. Fig". 4 isa. detail sectional view on the line 4-4 of Fig. 1. i

` Fig. 5 is la view looking vfrom the left hand end of Fig. lshowingfthehand'wheel means for opening the dam-per'. i Fig. 6 isa view `ofnltheline 6-6 of Fig. 1. Referring to the drawing in detail 1 des" ignates.the usual stove pipe, 2 the centrally located plate of the damperhaving the usual 'opening 3 therethrough. 4 and 5 arei'the:

baiiie plates which are .locat-edon the opposite sides of the plate 2.These plates, as shown, are made solidyor free from opening of any kind.They are secured to the plate 2 by means of the integral post members 6,7 8, and 9 ywhich are indicated on one side. of the plate 4 in planviewin Fig. 1 and in elevational view in Fig. 3. These posts areunderstoodl to be cast integral. with Vthe plates 2, 4, and 5, yandareof such length as to provide a'suitable space between the plates, asindicated at'10 and 11. The diameters of the plates 4and fare smallerthan that of the intermediate plate 2.

For the purpose of rotatably *supporting the damper, vspaced 'pivot orshaft 4'pins 12 and 13 are employed, which pins are formed withlaterally projecting or wing parts, 14 and 15 which pass through thegrooves or channels 16 and 17 (see Figs. 2'and 4) I` against the tensionof the springs 18 and 19. l"Vhen the wing parts 14 and 15 pass ,out ofthe grooves or channelsl and17 the oper-v ator turns these pins throughan" arcof C" permitting the wing parts to seat in the recesses 20 and21, as shown in Fig. 4. The expansive force of the ysprings 18 and19will' serve to retain the pins in this position,`

whereby when'th'epin or shaft 12 isv rot-ated by Vthehand wl1eel'22the'damper'as a will be turned. As Lshown in Fig. 2"the plate 2 is formedwith enlarged portion 2 in which the grooves or channels 16 and 17 areplaced and in iwhichthe 'ishafti12'is located. 22 designates an openingto receive the end of the shaft 12. 23 is a recessed knob or stop memberwhich is pinned to the shaft 13, as indicated at 24. The spring 19 isseated in the recess 23. 25 designates a plate which is Secured to theStove pipe 1

